She was supremely confident that there were only seven other Chosen surviving at the time... which would be Aran'gar, Moridin, Cyndane, Moghedien, Demandred, Semirhage, and Mesaana.

She KNEW Asmodean was out of the picture. And others did not seem to... IIRC, in KoD one of the other Forsaken said something about his location being unknown (or possibly it was Graendal herself in a moment of misdirection... if so, the knowledge in TGS takes precedence because its a thought in her head during her POV, rather than something she said which might be a lie).